The First Assess of the Haplotypes From
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The first assess of the haplotypes from COI gene sequences in species of spittlebugs (Cicadomorpha: Hemiptera) and aquatic true bugs (Gerromorpha and Nepomorpha: Hemiptera) in Brazil M.M.U. Castanhole1, S.R.C. Marchesin2, L.L.V. Pereira1, F.F.F. Moreira3, J.F. Barbosa3, J.R. Valério4 and M.M. Itoyama1 1Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista, Departamento de Biologia, São José do Rio Preto, SP, Brasil 2Universidade Paulista, São José do Rio Preto, SP, Brasil 3Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil 4EMBRAPA Gado de Corte, Campo Grande, MS, Brasil Corresponding author: M.M.U. Castanhole E-mail: [email protected] Genet. Mol. Res. 12 (4): 5372-5381 (2013) Received February 6, 2013 Accepted August 19, 2013 Published November 7, 2013 DOI http://dx.doi.org/10.4238/2013.November.7.12 ABSTRACT. We made the first analysis of the COI gene sequences of 22 species of spittlebugs and aquatic true bugs sampled in São Paulo State (Brazil) and used this information to determine the variability within these groups. Considering each codon position, we observed that the third base was the most variable, and the first base was the most conserved. Among species, Mahanarva fimbriolata and Deois flavopicta had the greatest genetic distance (0.181), and Notozulia entreriana and Mahanarva sp had the smallest distance (0.055), with an average variation of 0.119. In Gerromorpha, the Genetics and Molecular Research 12 (4): 5372-5381 (2013) ©FUNPEC-RP www.funpecrp.com.br Haplotypes from COI in spittlebugs and true bugs 5373 greatest distance occurred between Halobatopsis platensis and Rhagovelia zela (0.401), while between Cylindrostethus palmaris and Brachymetra albinervis albinervis, the distance was only 0.187; the average value observed for the Gerromorpha was 0.265. In the Nepomorpha, the species Buenoa antigone antigone and Belostoma micantulum had the greatest genetic distance (0.337), while Martarega brasiliensis and B. a. antigone had the smallest (0.154). The average value observed for Nepomorpha was 0.203. In Cicadomorpha (Auchenorrhyncha) and Nepomorpha (Heteroptera), the COI gene has been conserved; however, it is still useful for characterization of the different taxa. COI analysis was unable to resolve some of the Gerromorpha groups. Key words: Heteroptera; Auchenorrhyncha; Gerromorpha; Nepomorpha; MtDNA INTRODUCTION The order Hemiptera is currently classified into four suborders: Auchenorrhyncha, Coleorrhyncha, Sternorrhyncha, and Heteroptera (Carver et al., 1991; Forero, 2008). The sub- order Auchenorrhyncha (part of the paraphyletic clade Homoptera in former classifications) includes, among others, the spittlebugs, a group of hemipterans belonging to the superfamily Cercopoidea, which are important components of grass entomofauna. The family Cercopidae, an important member of this superfamily, is one of the largest groups of sucking insects, with representatives being phytophagous and feeding predominantly on xylem. Approximately 1500 species in 150 genera have so far been described in this family (Liang and Webb, 2002), where they are distributed mainly in tropical and subtropical regions. Of these, approximately 400 species are present in South America, with several important pests of forage grasses and sugar cane (Costes and Webb, 2004; Castanhole et al., 2010). In Brazil, these sharpshooters are also pests of sugar cane and pastures, and are therefore of great importance for biological control studies and systematics (Milanez et al., 1983; Zanol, 1996). Heteroptera, or true bugs, is the largest and most diverse group of insects with incomplete metamorphosis. This suborder has seven infraorders, including Gerromorpha and Nepomorpha, and approximately 80 families, which can be found on all continents except Antarctica and on some islands (Schuh and Slater, 1995). In the São José do Rio Preto region of Brazil, Heteroptera families that are commonly found include Belostomatidae, Coreidae, Gelastocoridae, Gerridae, Lygaeidae, Notonectidae, Pentatomidae, Phyrrocoridae, Reduviidae, Rhopalidae and Veliidae. They can be either phytophagous, predatory or hematophagous. Specifically, these insects can live as parasites of birds and mammals, feed on plants and fungi or capture other arthropods in spider webs or water. Also, a few Heteroptera species reside in the ocean (Schuh and Slater, 1995). Insects are extremely complex groups due to their great diversity of mitochondrial genomes with rearrangements and recombinations, related to substitution rates and nucleotide composition, suggesting the need for additional studies, including molecular approaches (Hua et al., 2008). Molecular analysis not only reveals the DNA sequence, but also polymorphisms Genetics and Molecular Research 12 (4): 5372-5381 (2013) ©FUNPEC-RP www.funpecrp.com.br M.M.U. Castanhole et al. 5374 whose genetic basis and particular modes of transmission can be precisely determined (Avise, 2004). Thus, the molecular data in several studies collected for different taxonomic groups have contributed to considerable advances in understanding the species’ biology, ecology, behavior, genetics and evolution (Sunnucks, 2000; Avise, 2004). Given the diverse characteristics of these suborders (Auchenorrhyncha and Heteroptera) and the evolutionary proximity of the groups, the use of molecular markers may be necessary for genetic characterization of these individuals. Such analyses could provide a better understanding of the group. The objective of this study was to carry out the first assessment of different haplotypes for 22 species belonging to spittlebugs and aquatic true bugs (Hemiptera) sampled in Brazil, using mitochondrial cytochrome c oxidase subunit 1 gene (COI) sequences, and to use this information to determine the variability within this group of insects. MATERIAL AND METHODS Taxon sampling A total of 22 species were used in this study, including four species belonging to the suborder Auchenorrhyncha (Cicadomorpha, Cercopidae) and 18 species of the aquatic and semi- aquatic infraorders (Gerromorpha and Nepomorpha) of the suborder Heteroptera (Table 1). Table 1. Species used in this study, broken down by family, suborder and infraorder. Suborder Infraorder Family Species Auchenorrhyncha Cicadomorpha Cercopidae Deois flavopicta (Stål, 1954) Mahanarva fimbriolata (Stål, 1854) Mahanarva sp (Stål, 1854) Notozulia entreriana (Berg, 1879) Heteroptera Gerromorpha Gerridae Brachymetra albinervis albinervis* (Amyot and Serville, 1843) Brachymetra albinervis albinervis** (Amyot and Serville, 1843) Cylindrostethus palmaris (Drake and Harris, 1934) Halobatopsis platensis (Berg, 1879) Limnogonus aduncus (Drake and Harris, 1933) Rheumatobates crassifemur crassifemur (Esaki, 1926) Veliidae Microvelia longipes (Uhler, 1894) Rhagovelia robusta (Gould, 1931) Rhagovelia tenuipes (Champion, 1898) Rhagovelia zela (Drake, 1959) Nepomorpha Belostomatidae Belostoma micantulum (Stål, 1858) Gelastocoridae Gelastocoris flavus flavus (Guérin-Méneville, 1835) Notonectidae Buenoa amnigenus (White, 1879) Buenoa antigone antigone (Kirkaldy, 1899) Buenoa unguis (Truxal, 1953) Martarega brasiliensis (Truxal, 1949) Martarega membranacea (White, 1879) Martarega uruguayensis (Berg, 1883) *Population 1 collected in São José do Rio Preto; **Population 2 collected in Jales. Auchenorrhyncha species were collected in Campo Grande, MS, Brazil (20°26ꞌS, 54°38ꞌW). Heteroptera species were collected in the cities of Américo de Campos (20°18ꞌS, 49°44ꞌW), Guaraci (20°30ꞌS, 48°56ꞌW), Jales (20°16ꞌS, 50°32ꞌW), Mirassol (20°49ꞌS, 49°30ꞌW), Sales (21°20ꞌS, 49°29ꞌW), and São José do Rio Preto (20°47ꞌS, 49°21ꞌW) in São Genetics and Molecular Research 12 (4): 5372-5381 (2013) ©FUNPEC-RP www.funpecrp.com.br Haplotypes from COI in spittlebugs and true bugs 5375 Paulo State, Brazil. Two populations of Brachymetra albinervis albinervis, population 1 (*) and population 2 (**), were collected in São José do Rio Preto and Jales, respectively. All samples were stored at -20°C in absolute ethanol at the Laboratory of Cytogenetic and Mo- lecular of Insects (LACIMI), Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista (UNESP), Campus São José do Rio Preto, SP, Brazil. Molecular data mtDNA was extracted using the protocol described by Tartarotti (2002) and the Ge- nomic DNA Extraction kit protocol from Machery Nagel Tissue. To obtain the sequence of the COI gene, we used two primers (1 and 2, Table 2) to first amplify the gene. The gene was amplified by PCR with the following conditions: denaturation at 94°C for 1 min; 35 cycles of denaturation (94°C for 30 s), annealing (temperature gradient 48 - 55°C for 1 min), extension (72°C for 1 min); and extension at 72°C for 7 min. The reaction consisted of 0.3 µL nucleo- tides (ATCG), 11.6 µL ddH2O, 0.44 µL MgCl2, 1.5 µL PCR buffer, 0.06 µL DNA Platinum Taq polymerase, and 0.3 µL primers (10 mM). Table 2. Primers used for the amplification and sequencing of theCOI gene. Primers Foward Reverse Measure (+-) Reference 1 TTTCAACAAATCATAAAGATATTGG TAAACTTCAGGGTGACCAAAAAATCA 700 bp Folmer et al. (1994) 2 CAACATTTATTTTGATTTTTTGG GAATACTGCTCCTATGGATA 500 bp Simon et al. (1994); Damgaard and Sperling (2001) After the amplification reactions, sequencing was performed, a total of 22 sequences were used for the species of the suborders Auchenorrhyncha (infraorder Cicadomorpha) and Heteroptera (infraorders Gerromorpha and Nepomorpha). The primers used for sequencing annealed to the 5ꞌ portion of the COI